Controlled vinyl-addition-type polymerization of norbornene initiated by several cobalt complexes having substituted terpyridine ligands
作者:Yoshinori Sato、Yuushou Nakayama、Hajime Yasuda
DOI:10.1016/j.jorganchem.2003.11.024
日期:2004.2
activities for the polymerization of norbornene (NBE). In particular, polymerization of NBE with 4/d-MAO system at room temperature resulted in quantitative yield within several hours to give the polymers with relatively narrow molecular weight distributions and controlled molecular weight. The polymerizations of NBE with these cobalt catalyst systems proceeded in vinyl addition polymerization, which was confirmed
具有三联吡啶衍生物的一系列钴(II)配合物,如2,2 ':6 ',2 '' -三联吡啶(1),4,4 ',4 '' - t Bu 3 -2,2 ':6 ',2 ″-吡啶(2),5,5″ -Me 2 -2,2 ′:6 ′,2″-吡啶(3),6,6″ -Me 2 -2,2 ′:6 ′,2″-特吡啶(4)和6,6''-(3,5-Me 2 C 6 H 3)2 -2,2 ':6 '合成了2,2'-叔吡啶(5)。的结构1,3和4是由X-射线晶体学确认。1中钴中心周围的配位球可描述为伪方形锥体。另一方面,复合物4具有伪三角双锥体结构。用d-MAO(干燥的甲基铝氧烷)活化后,这些络合物显示出高的降冰片烯(NBE)聚合活性。特别是NBE与4的聚合/ d-MAO系统在室温下可在数小时内实现定量收率,从而使聚合物具有相对较窄的分子量分布和可控的分子量。NBE与这些钴催化剂体系的聚合在乙烯基加成聚合中进行,这通过所得聚合物的1